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Idling losses are power losses which occur when the system is not subjected to a load, i.e. when the system is not doing any useful work. Idling losses in, for example, hydrostatic displacement machin

Compressor and motor are allowed to run. When the upper pressure value is reached, the compressor switches to idling mode. This is done by providing relief at the pressure side with the suction valve

Pressure generated when a device or system is idling (DIN 24 312).

Even an intact elastic seal will not always be tight. The reason for this is a complicated interplay involving drag flow , the direction of movement for the areas to be sealed, the shape and hardness

Flow rate escaping from pressure compartments in spite of seals , particularly in systems with purely metallic seals, without contributing any useful work. Apart from the geometric variables associate

Systems featuring leakage compensation ensure the pressure within individual devices does not drop — despite a leakage — by constantly compensating for any oil leaking out. This is achieved, for examp

Line which returns leaked fluid to the container. Its dimensions should ensure this is possible at all times with hardly any pressure — even at low temperatures.

The lifetime is the period during which a device or system is expected to remain functional as expressed by the number of achievable or achieved actuations under certain specified conditions.

Ability of a system (e.g. of a hydraulic drive) to yield as little as possible under an external load. Load stiffness for linear drives is mostly stated in N / μm. It can be compared with spring stiff

Typical demand made of the drive during a working cycle . .